random sticky?

I’m trying to add a box on my site that displays content from ONE randomly grabbed sticky post. My code doesn’t seem to work. I have:

<?php $args = array(
			'posts_per_page' => 1,
			'post__in'  => get_option('sticky_posts'),
			'caller_get_posts' => 1,
			'orderby' => rand
		);
		query_posts($args);
		?>

But that doesn’t seem to display the posts randomly. If I comment out the ‘caller_get_posts’ section, then all my stickies show up. Any help is appreciated!!